Attachment-plug.



swoon. ATTACHMENT PLUG.

APPLICATION FILED OCT. 25. I9I2.

1,1 67,232, Patented Jan.A 4, 1916.l

5 Vw@ nto@ SAMUEL TROOD, or PITTSBURGH,.rENNsYLvaNrm-assienon To THBBRYANT ELECTRIC COMPANY, or BRIDGEPORT, CONNECTICUT, a CORPORATION or CON- NECTICUT.

To all whom it may concern Beit known that I; SAMUEL TROOD, a cit-l,

. ment plugs, the Object of my invention being to provide an improved device of this-character readily and economically manufactured and efficient in use.

In the accompanying drawing; Figure 1 is a vertical section through an attachment plug in which -my invention is illustrativelyembodied; Fig. 2 islan innerv face view ofl one part, without wires; Fig. 3 is asimilar view of another part; and' Fig. 4 is a dropped vertical section through lthe plug.

In'the particular :embodiment of my invention shown the present plug comprises broadly two buttons A and B of insulating material, a sleeve C of metal incasing said buttons in part,'and a screw shellD swiveling on and in electrical Contact with said sleeve C. The upper button A is centrally apertul'ed at 10 to receive the leading-in wires while channels 11 and 12 opening on opposite sides of the central stud portion 13 spread the wires of di'erent polarity to their respective terminals. -The terminal 14 ofthe shell contact isformed on the inner faceof the sleeve' C in any suitable manner, for instance by sweating or solderthereon the angled' strap 14 which is .perforated at one end to receive the binding screw 15.. The center contact terminal is` formedv by the head ofv a screw bolt 16 passing axially through, the lower button B. The latter is preferabl provided with an elongated eyelet 17. o `heavy metal, thelower end of'which is'spread to form a methe head of the-bolt-l6.-v The threaded end of this" bolt 51:6- passing though vthe eyelet 17 is 'screwed rinto the internally threaded yl'elet .lfaxially secured the stud .13 of t Specication of Letters Patent.

Application led October 26, 19124. Serial No. 727,961.

e upper' button Ais that this bolt serves.,v

ATTACHMENTPLUG.

rammed Jan; Aa, taie.

' the double function of center-contact bind-v ing-screw and assembling bolt by which the vparts of the plug are held in operative relation.

It willbe `noted that the up er button insulating composition' not ,subject Y,to such v variation, this featureis of less importance and the stud 13 may, in assembled condition, be seated at the bottom ofthe well 21 formed to receive itV in the upper face of the lower button B. f A

The lower button B with its center contact projects beyond the screw shellD and the lower edge of the vsleeve C is provided 1with an outwardly extendingY abutment flange 22, here annularin shape, against which the lower edge of the screw 'shellD bears.- When the ycenter contact of the plug sov is bottomed in the socket, afurther rotation of, the screw/shell, by means of its operating flange 23 of insulation, forces the 1 lower edge of the shell down against the flange 22'on the sleeve C and thus insures a good electrical Contact between the two.

The manner of wiring the plug is readily understood. Having unscrewed the bolt 16 and removed the lower button B from position, the wires are lpassed through the passages -10, 11 and 12 inthe'upper button A andthe bared end of the shell contact wire clamped beneath the head -of thef binding screw 15. The button vB, is'then adjusted in position, the side recess 24: thereingaccommodating the binding screw-155 strap' terminal baredQend of the fwir'eof op v passed through `the longit'u linalperfor 25 on the op 'ositef-'side-efcf'ftlie butto ositefpola'rity iS ationl he c @b126- inthe header the, .e elem-Tand .clamped the wire 'leadngfintheretmwhile the thereto.

the head of the eyelet, forms the center contact of the plug.

lt is obvious that during the installation of the plug, the screw shell D alone rotates, swiveling on the sleeve C, while the plug isn drawn inward by reason of the engagement between the lower edge of the shell and the flange 22 on sleeve (l. Whenbottomed not only is the center contact of the plug in good electrical Contact with the center contact of the receptacle, but the screw shell D is firmly engaged at its lower edge with the flange 22 of the sleeve C.

The embodiment of my invention illustrated is ot" course merely exemplary of my invention.

l claim as-my invention l. An attachment plug comprisingvupper and lower insulating buttons, a metallic sleeve surrounding adjacent parts of said buttons and having a flange at one end, means for rigidly uniting said parts in assembled position, together with a screw shell in swiveling engagement with the flange on said sleeve and means to hold said screw shell against material longitudinal displacement with relation to said sleeve, substantially as described.

2. An attachment plug comprising upper and lower insulating buttons'pierced in register, a anged metallic sleeve surrounding adjacent parts of the buttons, an internally threaded eyelet lining the hole pierced in the upper button and a screw7 bolt passing through the lpierced lower button and taking into said .eyelet to rigidly unite said parts in readily detachable assembled condition, together with a screw shell in swiveling engagement with the ange on said sleeve and having only limited freedom of longitudinal displacement with relation 3. An attachment plug comprising upper and lower insulating buttons pierced in register, a Iianged metallic sleeve surrounding adjacent parts of the buttons and having a 'wing struck inwardly therefrom to form a wire terminal within the sleeve, a screw .shell surrounding and in swiveling engagement with the flange on said sleeve, a threaded socket in said upper button, ascrew bolt passing through the lower button and taking-into said socket to rigidly unite said parts in readily detachable assembled condition Mfor the purpose described.

4:. An attachment plug comprising upper and lower insulating buttons, peripheral shoulders thereon, a metallic sleeve engaged @tween said shoulders, a wire terminal and screwon the inner face ci said sleeve, a' center contact bolt passing through the lewer button and engagingthe up^er to hold said parts rigidly togetlier t. shell in swiveling engagem "it aid sleeve, said upper and lower ias/,eas

tons being apertured to afford an insulated channel for the wire leading to the 'center contact terminal.-

5. ln an attachment plug, an upper button providedwith a central stud axially perforated to receive a threaded eyelet, a lower button recessed to receive said stud and` perforated in register therewith to permit the passage of av securing bolt therethrough into engagement with thethreaded eyelct of the upperbutton, substantially as described.

6. In an' attachment plug an upper button centrally apertured` to permit the entrance of the leading-in wires, a central stud axially perforated to receive a securing bolt, said button having channels opening to said central aperture from opposite sides of said ripheral flange and central stud-receiving recess, a sleeve engaged between the shoulders on said buttons, a bolt passing through said lower button and engaging-the central stud ofthe upperbutton to hold. the parts in assembledl condition, a wire terminal on said sleeve,` said lower button being .perforated to permit thepassage of a leading-in wire to. the bolt head whereby .the latter may serve -as the centercontact wire terminal, and a screw shell, in swiveling contact with icc , said sleeve, substantially as described.

. 8. An attachment plug comprising upper and lower insulating buttons, shoulders thereon, a metallic sleeve engaged between 105. saidv shoulders and ascrew shell surroundingrand in swiveling engagement with said sleeve and also conned vbetween the said shoulders on the upper and lower buttons,

`to prevent material longitudinal; displace- 11o ment of said screw shell with relation to the other elements of the plug, substantially as described. I

9. An attachment plug comprising a shouldered insulating body, a metallic sleeve thereon having a liange spaced from the shoulder on said insulating body, in combination with a screw shell in swiveling engagement with said sleeve and confined against material longitudinal displacement 12o between the shoulder' on said `insulating body and the flange on the sleeve, substantially as described.

l0. An attachment plug comprising an -insulating body, a metallic sleeve thereon, means for electrically connecting the same to one of the leading-in wires Jfor the plug, a Flange on said sleeve anda screw shell side Contact for the plug in swiveling engagement with said sleeve and bearing against 13u said ange on the insertion of the plug, whereby the latter is drawn in as the screw shell is rotated and a good frictional contact between said screw shelland sleeve secured, substantially as described.

11. An attachment plug comprising upper and lower insulating buttons, a sleeve surrounding adjacent parts of said buttons and having an interiorly arranged wire terminal and binding screw thereon, a screw shell in swiveling engagement there- A with, a threaded socket in said upper button and an axially arranged bolt passing up through said lower button and taking into said socket, said bolt forming a center contact binding screw, substantially as de-- scribed.

. 12.. An attachment plug comprising upperl and lower insulating buttons, a s1eeve-sur rounding adjacent parts of said buttons and Copies of this patent may be obtained for ve cents each, by addressing the having an interiorly arranged wire terminal and blnding screw thereon, a screw shell in swiveling engagement therewith, a threaded socket in said upper button, an eyelet alined therewith in said lower button, the latter having a wire passage opening therethrough adjacent said eyelet, and a screw bolt passing through said Aeyelet and taking into said upper button to rigidly unite said parts in readily. detachable assembled condition, and serving as a center contactbinding screw, substantially as described. In testimony whereof I name to this speciiication, in the presence oftwo subscribing witnesses.

v SAMUEL TROOD.

Commissioner of Patents,

Washington, D. 6.1

have signed my 

